As we already stated, birds proceed in a different fashion. Among other reasons, because they do not have a bladder (ostriches are an exception to this). They lack two different output orifices, they have just the cloaca. Therefore, strictly speaking, we have to answer that they do not urinate.
Law of Urination: all mammals empty their bladders over the same duration. “The urinary system evolved to eject fluids from the body quickly and efficiently. Despite a long history of successful urology treatments in humans and animals, the physics of urination has received comparatively little attention.
The answer lies in the fact that birds, unlike mammals, don't produce urine. Instead they excrete nitrogenous wastes in the form of uric acid, which emerges as a white paste. And uric acid doesn't dissolve in water easily.
So, instead of excreting waste matter as both urine and faeces, birds (with the exception of the ostrich) ditch their waste in one go through an opening called the cloaca. They don't have bladders, nor urethral openings.
The emu, a large (40 kg) flightless bird, has low water requirements yet it has a limited ability to produce concentrated urine.
The function of waste control in all living organisms is one of the vital importance. Almost universally, terrestrial tetrapods have a urinary bladder with a storage function.
Chickens and all poultry have a combined waste called excreta that is feces and urine combined in the large intestine. Chickens do not have a bladder, so urine from the kidneys moves into the cloaca and by the act of reverse peristalsis is transferred into the large intestine.
In eagles, as in most birds, urine and feces are excreted together. The white stuff is the urine. Birds excrete far less urine than do mammals, so what is released is concentrated uric acid.
The ostrich has a urinary bladder in the form of a dilated pouch of ureter that stores the urine as it is secreted. The American rhea stores the urine in an expansion of the cloaca. So, in birds the urinary bladder is present in Ostrich and American Rhea.
In fact, shark's don't pee as we know it at all. Their urine is actually absorbed by their flesh, where the urea is used to keep their scale-like dermal denticles nice and moist. The rest is simply expelled back into the water through their 'skin'.
Freshwater fishes have to *get rid* of water constantly to keep their cells from bursting, which means they pee *a lot*. They're pretty much peeing all the time. If I peed as much as a freshwater fish, I'd release up to 28 liters a day, which is about 20 times more pee than I usually make.
Yes they do! But why? Well, like most living things, fish too produce waste from their metabolic processes. Peeing is one way of doing that and is referred to as excretion.
An elephant's bladder is about 1 1/2 feet tall. But its urethra is three feet long. If you could fit inside the end of the elephant's urethra, you'd feel the pressure of 4 1/2 feet of urine above you: the three-foot urethra plus the 1 1/2-foot bladder.
In Alaska, wood frogs go eight months without peeing. And scientists have now figured out how they do it, or more accurately, how they survive without doing it.
Birds, however, lack a urinary bladder and must compensate using these three organs. American flamingos are saltwater birds that ingest food with a high salt content and mostly drink salt water (with an osmolarity of usually 1000), hyperosmotic to the bodies cells .
Birds, unlike mammals, do not have separate exits for urine and feces.
Normal bird droppings consist of three components: feces, urine, and urates. Urine and urates are the products of the avian kidney. The medullary or mammalian nephron of the bird kidney produces urine.
During mating, the male bird goes on top of the female, facing the same direction. They have an entrance called cloaca which they rub against each other. From the cloaca, the male sperm passes onto the female ova, where it is fertilized. After fertilization, the egg comes out of the female cloaca.
Rooster Testicles
They've got two bean-shaped testes located against their backbone in front of the kidneys. Rooster testicles vary in size based on their age and time of year.
The majority of bunnies quickly learn to urinate in a tray, but will still scatter a few droppings on the floor. This is normal bunny behaviour and the dry, odourless droppings can easily be disposed of (see below).
Chickens DO NOT have nipples, and nipples are [almost] exclusively exclusive to mammals (with a few exceptions, one of which being the platypus which is a nipple-less mammal).
On average, it shouldn't take longer than 30 seconds to urinate, Freedland said. “Once you get going and it takes you a minute to empty your bladder, that's a problem. That's not normal.” How you position your body can also help, experts said.
Basically, if you time yourself peeing (over a period of time, not just one sitting) and find that you take significantly longer or shorter than 21 seconds, it can indicate that you are holding it in for too long, or not enough.
When it comes to pee production, whales are world champs. A single fin whale is thought to produce around 1,000 liters (260 gallons) of urine each day — enough to fill a 10-by-6-foot kiddie pool. Whales combine their champion urination with deep dives and long migrations.
This gives the physiological capacity of the adult male and female as 500 ml, and notes that there is probably no inherent difference between male and female. The habit of urination has a direct bearing on the size of the bladder.